vfprintf wide char print fix

[Artem B. Bityuckiy]

Hello. Here is the patch that fixes vfprintf's behavior if error occurs 
when converting wide characters/strings to multi-byte characters/strings 
(when %C, %S, %lc, %ls format modifiers are used).

Without this patch vfprintf doesn't return EOF as it must do.

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.
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